Investigators stand at the scene in Oakland Township, Mich., Wednesday, June 19, 2013 where officials attempt to restore the field to its natural condition after the FBI stopped the search for Jimmy Hoffa's remains. The FBI had been digging and searching for three days for the remains of Teamsters union president Hoffa who disappeared from a Detroit-area restaurant in 1975. (AP Photo/Carlos Osorio)

Investigators stand at the scene in Oakland Township, Mich., Wednesday, June 19, 2013 where officials attempt to restore the field to its natural condition after the FBI stopped the search for Jimmy Hoffa's remains. The FBI had been digging and searching for three days for the remains of Teamsters union president Hoffa who disappeared from a Detroit-area restaurant in 1975. (AP Photo/Carlos Osorio)